Hydrogen bonds.
The nucleotides in a base pair are complementary which means their shape allows them to bond together with hydrogen bonds. The A-T pair forms two hydrogen bonds. The C-G pair forms three. The hydrogen bonding between complementary bases holds the two strands of DNA together
        
             
        
        
        
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Answer:
 "it was once part of the organisms from which the fossil fuels formed"
 
        
             
        
        
        
How many genes control that trait
        
                    
             
        
        
        
Answer:
A. will not change from generation to generation.  
Explanation:
For a population in the Hardy-Weinberg equilibrium, allele frequencies do not change from generation to generation and remain constant. This occurs when:
-The population is large enough.
-Individuals of the population exhibit random mating
.
-No evolutionary force (natural selection, mutation, gene flow, etc.) is operative on the population.
Under these conditions, the allele frequencies of the population are not changed and the population is said to be in "Hardy-Weinberg equilibrium".